diff --git a/packages/next/build/webpack/loaders/next-serverless-loader/page-handler.ts b/packages/next/build/webpack/loaders/next-serverless-loader/page-handler.ts
index 526d4b5d615d7..99c6eb9aaf528 100644
--- a/packages/next/build/webpack/loaders/next-serverless-loader/page-handler.ts
+++ b/packages/next/build/webpack/loaders/next-serverless-loader/page-handler.ts
@@ -363,7 +363,11 @@ export function getPageHandler(ctx: ServerlessHandlerCtx) {
             }
             const statusCode = getRedirectStatus(redirect)
 
-            if (basePath && redirect.basePath !== false) {
+            if (
+              basePath &&
+              redirect.basePath !== false &&
+              redirect.destination.startsWith('/')
+            ) {
               redirect.destination = `${basePath}${redirect.destination}`
             }
 
diff --git a/packages/next/next-server/server/next-server.ts b/packages/next/next-server/server/next-server.ts
index ca02ba875a784..f009aef2c0f4c 100644
--- a/packages/next/next-server/server/next-server.ts
+++ b/packages/next/next-server/server/next-server.ts
@@ -1482,7 +1482,11 @@ export default class Server {
       const statusCode = getRedirectStatus(redirect)
       const { basePath } = this.nextConfig
 
-      if (basePath && redirect.basePath !== false) {
+      if (
+        basePath &&
+        redirect.basePath !== false &&
+        redirect.destination.startsWith('/')
+      ) {
         redirect.destination = `${basePath}${redirect.destination}`
       }
 
diff --git a/test/integration/gssp-redirect-base-path/pages/gsp-blog/[post].js b/test/integration/gssp-redirect-base-path/pages/gsp-blog/[post].js
index 8ce2202218ae3..70e3415dda472 100644
--- a/test/integration/gssp-redirect-base-path/pages/gsp-blog/[post].js
+++ b/test/integration/gssp-redirect-base-path/pages/gsp-blog/[post].js
@@ -28,7 +28,9 @@ export const getStaticProps = ({ params }) => {
   if (params.post.startsWith('redir')) {
     let destination = '/404'
 
-    if (params.post.includes('dest-')) {
+    if (params.post.includes('dest-external')) {
+      destination = 'https://example.com'
+    } else if (params.post.includes('dest-')) {
       destination = params.post.split('dest-').pop().replace(/_/g, '/')
     }
 
diff --git a/test/integration/gssp-redirect-base-path/pages/gssp-blog/[post].js b/test/integration/gssp-redirect-base-path/pages/gssp-blog/[post].js
index bd3d1f82ab1be..57fda28619e9e 100644
--- a/test/integration/gssp-redirect-base-path/pages/gssp-blog/[post].js
+++ b/test/integration/gssp-redirect-base-path/pages/gssp-blog/[post].js
@@ -22,7 +22,9 @@ export const getServerSideProps = ({ params }) => {
   if (params.post.startsWith('redir')) {
     let destination = '/404'
 
-    if (params.post.includes('dest-')) {
+    if (params.post.includes('dest-external')) {
+      destination = 'https://example.com'
+    } else if (params.post.includes('dest-')) {
       destination = params.post.split('dest-').pop().replace(/_/g, '/')
     }
 
diff --git a/test/integration/gssp-redirect-base-path/test/index.test.js b/test/integration/gssp-redirect-base-path/test/index.test.js
index f868aa3c929ad..cf38969fda73a 100644
--- a/test/integration/gssp-redirect-base-path/test/index.test.js
+++ b/test/integration/gssp-redirect-base-path/test/index.test.js
@@ -207,6 +207,54 @@ const runTests = (isDev) => {
     expect(pathname).toBe('/missing')
   })
 
+  it('should apply redirect when fallback GSP page is visited directly (external domain)', async () => {
+    const browser = await webdriver(
+      appPort,
+      `${basePath}/gsp-blog/redirect-dest-external`,
+      true,
+      true
+    )
+
+    await check(
+      () => browser.eval(() => document.location.hostname),
+      'example.com'
+    )
+
+    const initialHref = await browser.eval(() => window.initialHref)
+    expect(initialHref).toBe(null)
+  })
+
+  it('should apply redirect when fallback GSSP page is visited directly (external domain)', async () => {
+    const browser = await webdriver(
+      appPort,
+      `${basePath}/gssp-blog/redirect-dest-external`,
+      true,
+      true
+    )
+
+    await check(
+      () => browser.eval(() => document.location.hostname),
+      'example.com'
+    )
+
+    const initialHref = await browser.eval(() => window.initialHref)
+    expect(initialHref).toBe(null)
+
+    const res = await fetchViaHTTP(
+      appPort,
+      `${basePath}/gssp-blog/redirect-dest-external`,
+      undefined,
+      {
+        redirect: 'manual',
+      }
+    )
+    expect(res.status).toBe(307)
+
+    const parsed = url.parse(res.headers.get('location'))
+    expect(parsed.hostname).toBe('example.com')
+    expect(parsed.pathname).toBe('/')
+  })
+
   it('should apply redirect when GSSP page is navigated to client-side (internal dynamic)', async () => {
     const browser = await webdriver(
       appPort,
diff --git a/test/integration/gssp-redirect/pages/gsp-blog/[post].js b/test/integration/gssp-redirect/pages/gsp-blog/[post].js
index c571c57f23ea5..4701d1b925c76 100644
--- a/test/integration/gssp-redirect/pages/gsp-blog/[post].js
+++ b/test/integration/gssp-redirect/pages/gsp-blog/[post].js
@@ -28,7 +28,9 @@ export const getStaticProps = ({ params }) => {
   if (params.post.startsWith('redir')) {
     let destination = '/404'
 
-    if (params.post.includes('dest-')) {
+    if (params.post.includes('dest-external')) {
+      destination = 'https://example.com'
+    } else if (params.post.includes('dest-')) {
       destination = params.post.split('dest-').pop().replace(/_/g, '/')
     }
 
diff --git a/test/integration/gssp-redirect/pages/gssp-blog/[post].js b/test/integration/gssp-redirect/pages/gssp-blog/[post].js
index c1555f1ce4bc1..73921de9334eb 100644
--- a/test/integration/gssp-redirect/pages/gssp-blog/[post].js
+++ b/test/integration/gssp-redirect/pages/gssp-blog/[post].js
@@ -22,7 +22,9 @@ export const getServerSideProps = ({ params }) => {
   if (params.post.startsWith('redir')) {
     let destination = '/404'
 
-    if (params.post.includes('dest-')) {
+    if (params.post.includes('dest-external')) {
+      destination = 'https://example.com'
+    } else if (params.post.includes('dest-')) {
       destination = params.post.split('dest-').pop().replace(/_/g, '/')
     }
 
diff --git a/test/integration/gssp-redirect/test/index.test.js b/test/integration/gssp-redirect/test/index.test.js
index 441c4107e849f..79d1d8604b0ca 100644
--- a/test/integration/gssp-redirect/test/index.test.js
+++ b/test/integration/gssp-redirect/test/index.test.js
@@ -188,6 +188,54 @@ const runTests = (isDev) => {
     expect(pathname).toBe('/missing')
   })
 
+  it('should apply redirect when fallback GSP page is visited directly (external domain)', async () => {
+    const browser = await webdriver(
+      appPort,
+      '/gsp-blog/redirect-dest-external',
+      true,
+      true
+    )
+
+    await check(
+      () => browser.eval(() => document.location.hostname),
+      'example.com'
+    )
+
+    const initialHref = await browser.eval(() => window.initialHref)
+    expect(initialHref).toBe(null)
+  })
+
+  it('should apply redirect when fallback GSSP page is visited directly (external domain)', async () => {
+    const browser = await webdriver(
+      appPort,
+      '/gssp-blog/redirect-dest-external',
+      true,
+      true
+    )
+
+    await check(
+      () => browser.eval(() => document.location.hostname),
+      'example.com'
+    )
+
+    const initialHref = await browser.eval(() => window.initialHref)
+    expect(initialHref).toBe(null)
+
+    const res = await fetchViaHTTP(
+      appPort,
+      '/gssp-blog/redirect-dest-external',
+      undefined,
+      {
+        redirect: 'manual',
+      }
+    )
+    expect(res.status).toBe(307)
+
+    const parsed = url.parse(res.headers.get('location'))
+    expect(parsed.hostname).toBe('example.com')
+    expect(parsed.pathname).toBe('/')
+  })
+
   it('should apply redirect when GSSP page is navigated to client-side (internal dynamic)', async () => {
     const browser = await webdriver(
       appPort,